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LT3481 Datasheet

LT3481 Datasheet

36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Current
Part No.: LT3481
Page: 24 Pages
Size: 285 KB
Manufacturer: Linear Technology
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Views: 1
Update Time: 2023-12-01 09:41:31
DataSheet: Download

LT3481 Datasheet Applicable Part

Part No. Packing SPQ Marking MSL Pins Temp Range Package Description Buy
LT3481EDD#PBF Tube 121 LBVS 1 10 -40°C ~ 85°C 10-Lead (3mm × 3mm) Plastic DFN  
LT3481EDD#TRPBF Reel 2500 LBVS 1 10 -40°C ~ 85°C 10-Lead (3mm × 3mm) Plastic DFN  
LT3481EDD#TRMPBF Reel 500 LBVS 1 10 -40°C ~ 85°C 10-Lead (3mm × 3mm) Plastic DFN  
LT3481IDD#PBF Tube 121 LBVV 1 10 -40°C ~ 125°C 10-Lead (3mm × 3mm) Plastic DFN  
LT3481IDD#TRPBF Reel 2500 LBVV 1 10 -40°C ~ 125°C 10-Lead (3mm × 3mm) Plastic DFN  
LT3481IDD#TRMPBF Reel 500 LBVV 1 10 -40°C ~ 125°C 10-Lead (3mm × 3mm) Plastic DFN  
LT3481HDD#PBF Tube 121 LBVS 1 10 -40°C ~ 150°C 10-Lead (3mm × 3mm) Plastic DFN  
LT3481HDD#TRPBF Reel 2500 LBVS 1 10 -40°C ~ 150°C 10-Lead (3mm × 3mm) Plastic DFN  
LT3481HDD#TRMPBF Reel 500 LBVS 1 10 -40°C ~ 150°C 10-Lead (3mm × 3mm) Plastic DFN  
LT3481EMSE#PBF Tube 50 LTBVT 1 10 -40°C ~ 85°C 10-Lead Plastic MSOP  
LT3481EMSE#TRPBF Reel 2500 LTBVT 1 10 -40°C ~ 85°C 10-Lead Plastic MSOP  
LT3481EMSE#TRMPBF Reel 500 LTBVT 1 10 -40°C ~ 85°C 10-Lead Plastic MSOP  
LT3481IMSE#PBF Tube 50 LTBVW 1 10 -40°C ~ 125°C 10-Lead Plastic MSOP  
LT3481IMSE#TRPBF Reel 2500 LTBVW 1 10 -40°C ~ 125°C 10-Lead Plastic MSOP  
LT3481IMSE#TRMPBF Reel 500 LTBVW 1 10 -40°C ~ 125°C 10-Lead Plastic MSOP  
LT3481HMSE#PBF Tube 50 LTBVT 1 10 -40°C ~ 150°C 10-Lead Plastic MSOP  
LT3481HMSE#TRPBF Reel 2500 LTBVT 1 10 -40°C ~ 150°C 10-Lead Plastic MSOP  
LT3481HMSE#TRMPBF Reel 500 LTBVT 1 10 -40°C ~ 150°C 10-Lead Plastic MSOP  
SPQ:Standard Pack Quantity;MSL:Moisture Sensitivity Level

LT3481 Datasheet(PDF)

LT3481 Datasheet(Picture)

LT3481 Features

  • Wide Input Range: 3.6V to 34V Operating, 36V Maximum
  • 2A Maximum Output Current
  • Low Ripple Burst Mode® Operation
    • 50µA IQ at 12VIN to 3.3VOUT 
    • Output Ripple < 15mV
  • Adjustable Switching Frequency: 300kHz to 2.8MHz
  • Low Shutdown Current: IQ < 1µA
  • Integrated Boost Diode
  • Power Good Flag
  • Saturating Switch Design: 0.18Ω On-Resistance
  • 1.265V Feedback Reference Voltage
  • Output Voltage: 1.265V to 20V
  • Soft-Start Capability
  • Synchronizable Between 275kHz to 475kHz
  • Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages

LT3481 Applications

  • Automotive Battery Regulation
  • Power for Portable Products
  • Distributed Supply Regulation
  • Industrial Supplies
  • Wall Transformer Regulation

LT3481 Description

The LT3481 is an adjustable frequency (300kHz to 2.8MHz) monolithic buck switching regulator that accepts input voltages up to 34V (36V maximum). A high efficiency 0.18Ω switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application. In addition, the LT3481 can further enhance low output current efficiency by drawing bias current from the output when VOUT is above 3V. Shutdown reduces input supply current to less than 1µA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signals when VOUT reaches 90% of the programmed output voltage.

The LT3481 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance.

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